Re: Fork survived, head tube didn't!

Jambo wrote:
"jim beam" <spamvortex@xxxxxxxxxxxxxxx> wrote in message news:ZaqdnW0Q66QTgHvbnZ2dnUVZ_q6hnZ2d@xxxxxxxxxxxxxxxx
Jambo wrote:
Yeah, because "for a 6061 with E = 69GPa, and 275MPa yield, that gives an elastic
deformation limit of 0.275/69 x 100% = 0.04%."

CF still sucks.
no it doesn't - on a specific modulus basis, it's about the best material out there right now.
Yeah, because "for a 6061 with E = 69GPa, and 275MPa yield, that gives an elastic
deformation limit of 0.275/69 x 100% = 0.04%."

i don't understand the problem people have with a superior [stronger] material - just because the deformation mechanism is different. stronger is better. lighter is better. more fatigue resistant is better. carbon is impressive on all three counts.
Yeah, because "for a 6061 with E = 69GPa, and 275MPa yield, that gives an elastic
deformation limit of 0.275/69 x 100% = 0.04%."
if you want to make meat out of that typo mr. modulus, try omitting the formula - because that gives the correct answer. moron.
Really? You get 0.04% instead of 0.4%? And then you base your whole "brittle" argument on your mistaken arithmetic?
we were being quoted plastic elongation numbers and being asked to compare with elastic elongation in an apples to oranges scenario. i point out in an apples to apples comparison, that the elastic distortion range of aluminum [at 0.4% or even 0.04%] is still way less than 1.5% for carbon. sure, i made a typo, but the science was right and the conclusion was right.

The science was wrong since you based it on elastic deformation calculation that was wrong. Elastic range for Al alloys is around 0.4-0.5%. Carbon fibers in fact don't have published tensile yield strength, only tensile strength at break since CF does NOT YIELD, it BREAKS.

you don't read - that was my point.


However, since CF stress-strain curve is practically linear until break, using epoxy/fiber composite average values at http://www.matweb.com/search/SpecificMaterial.asp?bassnum=O1780:

0.810 GPa/190 GPa * 100 = 0.43%

How's that compare to Al 6061's 0.4%?

apart from being a dea link, the results for /composites/ depends on the fiber, the layup and the matrix! moron.



Your 1.5% elastic range for carbon fiber is WRONG, the science is WRONG, and the conclusion is WRONG, idiot!

*** you moron - read the freakin' thread. those are not my numbers they're peter cole's.



Let's go further - in the plastic range:

Elongation to failure of carbon fiber is typically 1.5%
(http://www.matweb.com/ - pick a carbon fiber).
Elongation to failure of 6061-t4 is 22-25%.

but that's plasticity, not elasticity - you're making the same moron error as peter cole!



"> 1. peter cole doesn't know what the *** he's talking about.
2. he's attempting to deceive."
HAHAHAHA! Fucktard idiot!
and what do we have from you? gross scientific error, compounded by further gross scientific error after what should have been a period in which corrective research could have been conducted, all spiced up with lies and lunatic moon howlings!

And of course you do know about science and scientific methodology, don't you? After your "materials lecture more than 30 years ago", your defining "inclusion" from a textbook, and your reading of textbook intros and Pop Science mags. Your confusion of specific modulus and young's modulus,

that's bull***. /you/ are the moron that got those terms confused. and you compounded it by making a bigger error two days of research later than you made the first one!!!


utter ignorance of basic physics,

er, like confusing density and weight??? moron.


and who can ignore your shiftiness in backpedalling, shifting goalposts, and very lame attempts at covering your lack of scientific understanding of basic metallurgy.

CF fork whisperer, "former metallurgist", lying fucktard extraordinaire - that's you, beamboy!
conclusion?

Well, we all know how your conclusions arte derived, don't we?

you need to see a doctor. i doubt he'll be able to do much for your i.q., but he might be able to stabilize your behavioral episodes, once the kind gentlemen in the white coats release you from the padded cell.

HAHAHAHA! Not very imaginative, and totally fails to detract from your moronic "science" bleatings! Tell us again about your CF fork conversations, beamboy!

when you can be bothered to learn basic grade school science, get back to us. otherwise, *** off and take your meds. goddamned moron.
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